北极海冰减退期间加拿大海盆潮流变化特征
Tidal Current Variations in Canada Basin during the Arctic Sea Ice Retreat
DOI: 10.12677/AMS.2018.52005, PDF,    国家自然科学基金支持
作者: 徐道欢, 杜 凌*, 马靖凯：中国海洋大学海洋与大气学院，山东 青岛
关键词: 潮流；半月变化；加拿大海盆；潮流–海冰相互作用；Tidal Current； Semi-Monthly Oscillation； Canada Basin； Tidal Current-Sea Ice Interaction
摘要: 近年来北极海冰快速变化，北冰洋上层海洋环流和潮流也发生变化。本文利用波弗特流涡勘探计划(Beaufort Gyre Exploration Project)的锚定实测海流数据，分析了2005~2016年间加拿大海盆的近表层潮流的变化特征。潮流类型主要为半日潮，且随海冰面积、平均流以及大气风场的变化而改变。海冰快速减退期间加拿大海盆的主要半日和全日分潮流较小，但潮流流速变化显著，潮流椭圆呈顺时针旋转，椭圆倾角则随深度逆时针旋转。融冻期会出现潮流增大的情形。本文对比分析了2012年夏季和2007/08年冬季的潮流垂直结构，发现融冻期加拿大海盆海流存在显著半月周期变化。半月MSf分潮流和平均流均呈正压结构，垂直剪切明显偏弱，而同期半日M2分潮流则表现出较为明显的分层结构。融冻期近表层半月分潮流增大是受大气风场半月周期变化的影响，而半日分潮流垂直结构差异则可能与局地惯性运动有关。
Abstract: In recent years, Arctic upper oceanic and tidal current are changed accompanied with sea ice rapidly declined. In this study, we analyzed the variations of near-surface tidal current in Canada Basin from 2005 to 2016. Canada Basin is dominated by semidiurnal constituent and the tide is changed with the variations of local sea ice areas, mean flow and surface wind. The speed of semidiurnal and diurnal constituent are small in Canada Basin, while the oscillation is significant that tidal current is always intensified during melting-frozen season. Compared with summer of 2012 and winter of 07/08, the semi-monthly oscillation has been found in oceanic current. Both tidal and mean flow component of MSf present barotropic structure that the vertical shear is weak, while the M2 constitute shows layered structure. It’s considered that the enhanced of semi-monthly current is influenced by wind field, while the layered structure of M2 is related with local inertial motion.
文章引用：徐道欢, 杜凌, 马靖凯. 北极海冰减退期间加拿大海盆潮流变化特征[J]. 海洋科学前沿, 2018, 5(2): 38-47. https://doi.org/10.12677/AMS.2018.52005

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